Pipette Capacitive Touch Sensing for Contamination Prevention
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Solution Overview
Problem
Existing pipettes lack effective mechanisms to prevent cross-contamination and ensure safe operation, particularly when used with bare hands or contaminated with liquid, and they also have limited user-friendly interfaces for adjusting volumes.
Innovation Solution
The integration of a capacitive touch sense array with a processing device that uses machine learning and digital signal processing methods to differentiate between gloved and bare hands, detect moisture, and recognize gestures for volume adjustments, thereby enhancing the Human Machine Interface (HMI) of the pipette.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch sense array is used to improve HMI for pipette operations, then ease of operation is improved, but the ability to classify touch objects (gloved hand, bare skin, liquid) is insufficient leading to cross-contamination risks
Solution Approach 1:
The system changes the parameters analyzed by the touch sense array from simple touch detection to multi-parameter analysis including capacitance values, touch duration, touch pressure, and touch location. These parameter changes enable differentiation between gloved hands, bare skin, and liquid contacts, resolving the contradiction by maintaining ease of operation while adding reliability through cross-contamination prevention.
Solution Approach 2:
The system implements feedback by providing visual indicators on the display that show the detected touch type (gloved hand, bare skin, or liquid). This feedback mechanism allows users to immediately understand the system's interpretation of their input, enabling corrective action if contamination is detected, thus improving reliability without compromising ease of operation.
2Device complexity
If traditional touch buttons are used for volume adjustment, then device complexity is reduced, but ease of operation deteriorates when users wear gloves
Solution Approach 1:
The system adds the dimension of touch classification to the volume control mechanism. Instead of relying solely on simple button presses, the system analyzes multiple dimensions of touch input including capacitance, duration, and pressure patterns. This allows gloved users to operate the device effectively while maintaining relatively simple device architecture.
3Ease of operation
If bare hands are used to operate pipettes, then ease of operation is maximized, but cross-contamination and safety issues increase
Solution Approach 1:
The system applies preliminary anti-action by detecting potential contamination sources (bare skin, liquid) before contamination can occur. When bare skin or liquid is detected, the system provides immediate visual feedback and can prevent pipette operation, stopping the contamination process before it affects samples or compromises safety.
Solution Approach 2:
The system converts the potentially harmful presence of bare skin or liquid into a beneficial safety feature. By using the touch sense array's ability to detect these substances, the system transforms a contamination risk into an opportunity for preventive action, ensuring sample integrity and operator safety while maintaining ease of operation through clear user feedback.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents cross-contamination by ensuring proper hand hygiene and liquid handling, while also providing an intuitive and accurate method for adjusting pipette volumes, thus improving both safety and operational efficiency.
Implementation Method 1
a capacitive touch sense array with a processing device that uses machine learning and digital signal processing methods to differentiate between gloved and bare hands, detect moisture
Data Source
AI summary
A pipette has an electronic system that includes a capacitive sense array, a processing device and an electric switch. The processing device scans the sense array to obtain sense signals from the electrodes of the sense array when finger(s)/hand touch the sense array, generates images based on the sense signals and processes the images to classify if the touching finger(s)/hand is covered by materials such as nitrile/latex gloves other than bare skin. The electric switch can then turn on or off the pump based on these classifications. It can issue warning messages in the case of fingers being bare skinned and prompt corrective measures. Thus, prevents bare skinned hand contaminating the pipette. With the same sense signal, the processing device can also detect the motion parameters and recognize associated gestures of the touching fingers. The processing device can further adjust certain settings of the pipette according to the recognized gestures.